Filter



FIG. 1 is a perspective view of a filter showing my new design;

FIG. 2 is side elevational view thereof, the opposite side being amirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a rear elevational view thereof.

The ornamental design for a filter, as shown and described.